Where is the math u are talking about
Answer:
b) all interior angles are right angles

Chance of boy: 627/1,358
Chance of girl: 731/1,358
9. she spends 1 hour total and 1/2 hour on spanish. So she has another 1/2 on another subject ( as she spends equal time on each subject)
So number of subjects = 1 / 1/2 = 1 * 2 = 2
Y=-4 is one of your answers